A kind of unwinding mechanism of packaging bag printing equipment

Abstract

The application belongs to the technical field of printing equipment, and particularly relates to a unwinding mechanism of a packaging bag printing equipment, which comprises a unwinding roller for supporting a material roll for printing; a idler roller which is arranged at intervals with the unwinding roller and supports the material roll together with the unwinding roller; a first motor which is mechanically connected with the unwinding roller and is used for driving the unwinding roller to rotate; a power assembly which comprises a pulling roller which is rotatable and pulls the printing material out of the printing roller, and a second motor which is connected with the pulling roller and drives the pulling roller to rotate; an adjusting mechanism which comprises a pressing roller which rotates with the pulling roller, and an adjusting assembly which is used for maintaining the pressure between the pressing roller and the pulling roller, and the adjusting assembly is connected with the pressing roller; wherein, the controller is connected with the first motor and the second motor, the controller is used for sending a first control signal representing a required rotating speed to the first motor, and sending a second signal representing a required torque to the second motor.

Description

Technical Field

[0001] This application belongs to the field of printing equipment technology, and in particular relates to an unwinding mechanism for a packaging bag printing equipment. Background Technology

[0002] Packaging bags, as carriers for various goods, facilitate transportation and storage during production and distribution, and are widely used in daily life and industrial production. Classified by manufacturing process, packaging bags often include plastic packaging bags and composite packaging bags, with plastic packaging bags further encompassing woven plastic bags and plastic film bags.

[0003] In the packaging bag production process, printing equipment is the key equipment for printing patterns, logos, and other information onto the surface of the packaging bag, and its performance directly affects the appearance quality and user experience of the packaging bag. In existing printing equipment, the unwinding mechanism is an important component to ensure a stable supply of roll material. Currently, most unwinding mechanisms use external drive rollers in conjunction with motors to pull the roll material to achieve the unwinding operation.

[0004] However, in practical applications, the above-mentioned unwinding method has significant shortcomings. Because the roll material itself has a certain weight, a large tension is required to rotate the roll and smoothly release it when pulled by an external drive roller. This high tension, when applied to thin packaging materials (such as those used in some plastic film bags), easily causes stretching deformation, breakage, and other damage. When the damage is severe, it can directly lead to interruptions in the packaging bag production process and even cause printing equipment malfunctions. This not only affects production efficiency but also increases production costs and material waste, making it difficult to meet the stable printing production needs of thin packaging materials. Therefore, improvements are needed. Utility Model Content

[0005] The purpose of this application is to provide an unwinding mechanism for a packaging bag printing equipment that can solve the above-mentioned problems.

[0006] The purpose of this application is to provide an unwinding mechanism for a packaging bag printing device, comprising: Unwinding rollers are used to support rolls of printing materials. Inert rolls are spaced apart from unwind rolls and support the material roll together with unwind rolls; The first motor is mechanically connected to the unwinding roll and is used to drive the unwinding roll to rotate. The power assembly includes a rotatable pull roller that pulls printing material out of the printing roller and a second motor connected to the pull roller and driving the pull roller to rotate; The adjustment mechanism includes a pressure roller that rotates with the pull roller and an adjustment assembly for maintaining the pressure between the pressure roller and the pull roller, the adjustment assembly being connected to the pressure roller; It also includes a controller, which is connected to the first motor and the second motor. The controller is used to send a first control signal representing the required speed to the first motor and a second signal representing the required torque to the second motor.

[0007] The unwinding mechanism of the aforementioned packaging bag printing equipment uses an unwinding roller and an idler roller to support the material roll, providing a stable support foundation and preventing the material roll from swaying or shifting during unwinding due to unstable support. This prevents uneven local tension caused by material swaying. The first motor is directly mechanically connected to and drives the unwinding roller to rotate, changing the method of relying on an external drive roller to pull the roll material. It actively controls the release of the roll material from the unwinding source, reducing the forced traction force on the roll material during external pulling, effectively reducing the risk of damage to thin packaging materials due to high tension, and avoiding production interruptions caused by material stretching deformation or breakage.

[0008] Simultaneously, the pull roller in the power assembly rotates under the drive of the second motor, smoothly pulling the printing material out from the unwind roller. In conjunction with the pressure roller of the adjustment mechanism, the pressure between the pressure roller and the pull roller is maintained by the adjustment component, ensuring that the material remains in contact during the pulling process. This prevents material slippage and unwinding speed disturbances, further stabilizing the tension during material transmission. The controller is connected to the first and second motors, sending control signals to both to adjust the speed and torque, achieving matching between the unwinding and pulling speeds. This ensures synchronized release and traction of the roll material, avoiding tension fluctuations caused by speed mismatch and further protecting thin materials from tension impacts.

[0009] Meanwhile, the controller can also adjust the position of the support platform by controlling the linear drive, and combined with the adjustment of the speed of the first motor and the torque of the second motor, it can flexibly adjust the tension applied to the adjustment mechanism. It can adapt to the optimal tension according to the packaging materials of different thicknesses and materials, meet the unwinding needs of various specifications of packaging materials, and improve the versatility of the equipment.

[0010] Furthermore, in this application, the adjustment component includes springs, cylinders, etc., which are existing structures and will not be described in detail here. The adjustment component pushes the pressure roller toward the pull roller, so that pressure is maintained between the pressure roller and the pull roller, allowing the material to be pulled by the pull roller.

[0011] Furthermore, it also includes a laser sensor, connected to the controller and located above the material roll, for detecting the remaining unwound material on the material roll.

[0012] A laser sensor, located above the material roll and connected to the controller, can detect the remaining unwound material on the roll in real time. This provides timely feedback on the material roll's consumption status, preventing sudden material shortages due to inaccurate remaining quantity assessment and ensuring production continuity. Simultaneously, a pressure sensor is added to the laser sensor and mounted on the support platform. Working together, these two sensors enable dual detection of the remaining material roll quantity. The laser sensor determines the remaining quantity based on the roll's appearance, while the pressure sensor indirectly determines it by sensing the weight borne by the support platform. This complementary approach improves the accuracy of remaining material roll detection and avoids errors that can occur with a single sensor. Precise remaining quantity detection allows operators to anticipate roll changeover times, providing ample time to prepare new rolls, reducing changeover waiting time, improving production efficiency, preventing equipment idling or insufficient material supply due to late roll changeovers, and further reducing production costs.

[0013] In addition, after receiving the remaining amount information from the sensor, the controller can adjust the speed of the first motor, the torque of the second motor, and the tension of the adjustment mechanism in advance based on the trend of the remaining amount change. This ensures that the unwinding tension remains stable as the diameter of the material roll gradually decreases, avoiding tension fluctuations caused by changes in the weight of the material roll, protecting the material from damage, and maintaining the stability of the unwinding process.

[0014] Furthermore, the distance between the idler roller and the unwinding roller is fixed, and the distance between them is set to support the material roll when the material roll diameter is at its widest, and to prevent the material roll from falling between the unwinding roller and the idler roller when the material roll diameter is at its narrowest.

[0015] The fixed distance between the idler roller and the unwinding roller supports the material roll even when its diameter is at its widest. This ensures that the overall weight of the material roll is evenly distributed between the two rollers during the initial unwinding stage, preventing imbalances caused by a wide diameter and heavy weight. It also prevents edge wear or uneven tension due to roll tilting, ensuring stability during the initial unwinding stage. Simultaneously, this fixed distance prevents the material roll from falling between the unwinding roller and the idler roller when its diameter is at its narrowest. This prevents the material roll from getting stuck between the rollers due to its small diameter, avoiding material tearing or equipment malfunctions caused by jamming. This ensures safe and stable unwinding from beginning to end, without support failure due to diameter changes.

[0016] In addition, the fixed distance between the two rollers ensures that the contact position between the material roll and the two rollers remains relatively stable throughout the unwinding cycle, reducing the offset of the material roll support point caused by changes in the distance between the two rollers. This makes the material transmission path more stable during unwinding and avoids material deviation caused by support point offset.

[0017] Furthermore, a support platform is installed at the bottom of the idler roller and the unwinding roller, and a slide rail extending in a direction parallel to the axis of the unwinding roller is installed at the bottom of the support platform. The support platform is slidably mounted on the slide rail by a slider.

[0018] The support platforms at the bottom of the idler roller and unwind roller provide a mounting carrier for the two rollers, evenly distributing the weight of the rollers and the material roll. This prevents the rollers from sinking or tilting due to uneven force, ensuring that the rollers maintain a stable working posture and providing stable support for the material roll. A slide rail extending parallel to the axis of the unwind roller at the bottom of the support platform, along with a slider, allows the support platform to slide along the rail. This structure provides the support platform with flexible horizontal movement capabilities, facilitating the adjustment of the horizontal position of the unwind roller and idler roller according to the specifications of the material roll or the position of the subsequent traction structure. This ensures precise alignment of the material roll with the traction structure, preventing material deviation during transport due to positional errors. Furthermore, it prevents uneven tension or edge wear caused by material deviation, protecting the integrity of the material.

[0019] Meanwhile, the sliding installation method also facilitates the loading and unloading of material rolls. When changing material rolls, the position can be adjusted through the sliding support platform to increase the operating space, reduce the difficulty of alignment during material roll installation, shorten loading and unloading time, and improve roll changing efficiency.

[0020] Furthermore, the support platform is provided with an installation platform for supporting the idler roller and the unwinding roller, and the unwinding roller and the idler roller are fixedly installed on the platform.

[0021] The mounting platform on the support platform provides dedicated, fixed mounting positions for the unwinding roll and idler roll, ensuring that the relative positions of the two rolls are precise and stable after installation. This prevents positional shifts caused by vibrations, tension changes, or equipment impacts during unwinding. Fixed mounting of the unwinding roll and idler roll ensures that the material roll maintains stable contact with the rolls throughout the unwinding process, reducing relative sliding between the material roll and the rolls. This prevents scratches on the material surface caused by sliding, protecting the material's appearance, reducing wear on the rolls due to sliding friction, and extending the roll's service life.

[0022] In addition, the fixed installation of the two rollers can ensure the stability of the transmission path when the material roll is unwound, so that the material can enter the subsequent traction structure along the fixed path after being released from the unwound roller, avoiding the change of the material transmission path due to the position of the roller, thereby preventing the printed pattern from being misaligned due to the material and improving the product qualification rate.

[0023] Furthermore, a linear actuator is also installed at the bottom of the support platform to drive the support platform to move along the slide rail.

[0024] The linear actuator at the bottom of the support platform provides power to move the support platform along the slide rail. Compared with manual adjustment, it can achieve precise control of the position of the support platform, and can quickly and accurately adjust the support platform to the required position, ensuring that the material roll and the traction structure are precisely aligned. This avoids the material deviation caused by the error of manual adjustment, improves the material alignment accuracy, and thus ensures the accuracy of the pattern printing position in the subsequent printing process, reducing printing defects caused by misalignment.

[0025] Meanwhile, the linear actuator can flexibly adjust the drive speed and displacement according to the controller's control signals. During unwinding, it can fine-tune the support platform position in real time based on the unwinding status of the material roll, changes in remaining weight, or slight offsets in the traction structure. This ensures the material roll maintains optimal alignment with the traction structure, preserving material transmission stability and preventing tension fluctuations caused by positional deviations, further protecting thin materials from tensile impacts. The linear actuator here can be either a pneumatic cylinder or a hydraulic cylinder.

[0026] The beneficial effects of this application are: 1. The first motor is directly mechanically connected to the unwinding roller and drives its rotation, which changes the way of relying on external drive rollers to pull the roll material. It actively controls the release of the roll material from the unwinding source, reduces the forced traction force on the roll material when pulled externally, effectively reduces the risk of damage to thin packaging materials due to high tension, and avoids production interruption caused by material stretching deformation or breakage. 2. The controller is connected to the first motor and the second motor, and can send control signals to both to adjust the speed and torque, so as to match the unwinding speed and the pulling speed, so that the release and traction processes of the roll material are synchronized, avoiding tension fluctuations caused by speed mismatch, and further protecting thin materials from tension impact. 3. The controller can also adjust the position of the support platform by controlling the linear drive. Combined with the adjustment of the speed of the first motor and the torque of the second motor, it can flexibly adjust the tension applied to the adjustment mechanism. It can adapt to the optimal tension according to the packaging materials of different thicknesses and materials, meet the unwinding requirements of various specifications of packaging materials, and improve the versatility of the equipment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the motor structure from another perspective of this utility model; Figure 3 This is a connection block diagram of the controller of this utility model.

[0028] The reference numerals in the figure are as follows: 100, unwinding roller; 110, first motor; 200, material roll; 300, idler roller; 400, pull roller; 410, second motor; 500, pressure roller; 600, adjusting assembly; 700, controller; 800, laser sensor; 900, support platform; 910, slide rail; 920, slider; 930, mounting platform; 940, linear actuator. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0030] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] The unwinding mechanism of the packaging bag printing equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0032] Example 1:

[0033] like Figures 1 to 3 As shown in the figure, this application embodiment provides an unwinding mechanism for a packaging bag printing equipment, including: Unwinding roller 100 is used to support printing material roll 200; The idler roller 300 is spaced apart from the unwinding roller 100 and together with the unwinding roller 100 supports the material roll 200; The first motor 110 is mechanically connected to the unwinding roller 100 and is used to drive the unwinding roller 100 to rotate. The power assembly includes a rotatable pull roller 400 that pulls printing material out of the printing roller and a second motor 410 connected to the pull roller 400 and driving the pull roller 400 to rotate; The adjustment mechanism includes a pressure roller 500 that rotates with the pull roller 400 and an adjustment assembly 600 for maintaining the pressure between the pressure roller 500 and the pull roller 400, the adjustment assembly 600 being connected to the pressure roller 500. It also includes a controller 700, which is connected to the first motor 110 and the second motor 410. The controller 700 is used to send a first control signal representing the required speed to the first motor 110 and a second signal representing the required torque to the second motor 410.

[0034] In some embodiments of this application, such as Figure 1 As shown, the unwinding mechanism of the aforementioned packaging bag printing equipment uses an unwinding roller 100 and an idler roller 300 to support the material roll 200. This provides a stable support foundation for the material roll 200, preventing it from swaying or shifting during unwinding due to unstable support, and thus preventing uneven local tension caused by material swaying. The first motor 110 is directly mechanically connected to and drives the unwinding roller 100 to rotate, changing the method of relying on an external drive roller to pull the roll material. It actively controls the release of the roll material from the unwinding source, reducing the forced traction force on the roll material during external pulling, effectively reducing the risk of damage to thin packaging materials due to high tension, and avoiding production interruptions caused by material stretching deformation or breakage.

[0035] Meanwhile, the pull roller 400 in the power assembly rotates under the drive of the second motor 410, smoothly pulling the printing material out from the unwind roller 100. In conjunction with the pressure roller 500 of the adjustment mechanism, the pressure between the pressure roller 500 and the pull roller 400 is maintained by the adjustment component 600. This ensures that the material remains in contact during the pulling process, preventing slippage and subsequent unwinding speed disturbances, further stabilizing the tension during material transport. The controller 700 is connected to the first motor 110 and the second motor 410, and can send control signals to both to adjust the speed and torque, achieving matching between the unwinding speed and the pulling speed. This ensures synchronized release and traction of the roll material, avoiding tension fluctuations caused by speed mismatch, and further protecting thin materials from tension impacts.

[0036] Meanwhile, the controller 700 can also adjust the position of the support platform 900 by controlling the linear driver 940, and combined with the adjustment of the speed of the first motor 110 and the torque of the second motor 410, it can flexibly adjust the tension applied to the adjustment mechanism, and can adapt to the optimal tension according to the packaging materials of different thicknesses and materials, meet the unwinding requirements of various specifications of packaging materials, and improve the versatility of the equipment.

[0037] Furthermore, in this application, the adjusting component 600 includes springs, cylinders, etc., which are existing structures and will not be described in detail here. The adjusting component 600 pushes the pressing roller 500 toward the pulling roller 400, so that pressure is maintained between the pressing roller 500 and the pulling roller 400, so that the material can be pulled by the pulling roller 400.

[0038] Example 2:

[0039] This application provides an unwinding mechanism for a packaging bag printing equipment. In addition to the above-mentioned technical features, the unwinding mechanism of the packaging bag printing equipment in this application also includes the following technical features.

[0040] like Figures 1 to 3 As shown, it also includes a laser sensor 800, which is connected to the controller 700 and located above the material roll 200, for detecting the remaining unwound material on the material roll 200.

[0041] In this embodiment, the laser sensor 800 is located above the material roll 200 and connected to the controller 700. It can detect the remaining unwound material on the material roll 200 in real time, providing timely feedback on the consumption status of the material roll 200. This avoids sudden material shortages due to inaccurate measurement of the remaining amount, preventing production interruptions and ensuring the continuity of the production process. Simultaneously, a pressure sensor is added to the laser sensor 800 and installed on the support platform 900. The two sensors work together to achieve dual detection of the remaining amount on the material roll 200. The laser sensor 800 determines the remaining amount from the appearance of the material roll 200, while the pressure sensor indirectly determines the remaining amount by sensing the weight borne by the support platform 900. These two detection methods complement each other, improving the accuracy of the remaining amount detection and avoiding errors that may occur with a single sensor. Accurate remaining amount detection allows operators to know in advance when to change rolls, providing sufficient time to prepare new material rolls 200, reducing waiting time, improving production efficiency, preventing equipment idling or insufficient material supply due to late roll changes, and further reducing production costs.

[0042] In addition, after receiving the remaining amount information from the sensor, the controller 700 can adjust the speed of the first motor 110, the torque of the second motor 410, and the tension of the adjustment mechanism in advance based on the trend of the remaining amount change. This ensures that the unwinding tension remains stable as the diameter of the material roll 200 gradually decreases, avoiding tension fluctuations caused by changes in the weight of the material roll 200, protecting the material from damage, and maintaining the stability of the unwinding process.

[0043] Furthermore, the distance between the idler roller 300 and the unwinding roller 100 is fixed, and the distance between them is set to support the material roll 200 when the diameter of the material roll 200 is at its widest, and to prevent the material roll 200 from falling between the unwinding roller 100 and the idler roller 300 when the diameter of the material roll 200 is at its narrowest.

[0044] The distance between the idler roller 300 and the unwinding roller 100 is fixed, and it supports the material roll 200 when its diameter is at its widest. This ensures that the overall weight of the material roll 200 is evenly supported by both rollers during the initial unwinding stage, preventing imbalance due to its wide diameter and heavy weight. It also prevents edge wear or uneven tension caused by tilting of the material roll 200, ensuring stability during the initial unwinding stage. Simultaneously, this fixed distance prevents the material roll 200 from falling between the unwinding roller 100 and the idler roller 300 when its diameter is at its narrowest. This prevents the material roll 200 from getting stuck between the two rollers due to its small diameter, avoiding material tearing or equipment malfunctions caused by jamming. This ensures safe and stable operation of the entire unwinding process from initial to final stages, without support failure due to diameter changes.

[0045] In addition, the fixed distance between the two rollers ensures that the contact position between the material roll 200 and the two rollers remains relatively stable throughout the unwinding cycle, reducing the offset of the support point of the material roll 200 caused by changes in the distance between the two rollers. This makes the material transmission path more stable during the unwinding process and avoids material deviation caused by the offset of the support point.

[0046] Example 3:

[0047] This application provides an unwinding mechanism for a packaging bag printing equipment. In addition to the above-mentioned technical features, the unwinding mechanism of the packaging bag printing equipment in this application also includes the following technical features.

[0048] like Figure 1 and Figure 2 As shown, a support platform 900 is installed at the bottom of the idler roller 300 and the unwinding roller 100. A slide rail 910 extending in a direction parallel to the axis of the unwinding roller 100 is installed at the bottom of the support platform 900. The support platform 900 is slidably mounted on the slide rail 910 by a slider 920.

[0049] In this embodiment, the idler roller 300 and the support platform 900 at the bottom of the unwinding roller 100 provide mounting carriers for the two rollers, which can evenly transfer the weight of the two rollers and the weight of the material roll 200, preventing the two rollers from sinking or tilting due to uneven force, ensuring that the two rollers always maintain a stable working posture, and providing a guarantee for the stable support of the material roll 200. The slide rail 910 extending parallel to the axis of the unwinding roller 100 at the bottom of the support platform 900, together with the slider 920, allows the support platform 900 to slide along the slide rail 910. This structure allows the support platform 900 to have flexible horizontal movement capability, which makes it easy to adjust the horizontal position of the unwinding roller 100 and the idler roller 300 according to the specifications of the material roll 200 or the position of the subsequent traction structure, so that the material roll 200 can be accurately docked with the traction structure, avoiding the material from deviating during the transmission process due to positional deviation, thereby preventing uneven tension or edge wear caused by the material deviating, and protecting the integrity of the material.

[0050] Meanwhile, the sliding installation method also facilitates the loading and unloading of material roll 200. When replacing material roll 200, the position can be adjusted through the sliding support platform 900 to increase the operating space, reduce the alignment difficulty during the installation of material roll 200, shorten the loading and unloading time, and improve the efficiency of roll replacement.

[0051] Furthermore, the support platform 900 is provided with an installation platform 930 for supporting the idler roller 300 and the unwinding roller 100, and the unwinding roller 100 and the idler roller 300 are fixedly installed on the platform.

[0052] The mounting platform 930 on the support platform 900 provides a dedicated fixed mounting position for the unwinding roller 100 and the idler roller 300, ensuring that the relative positions of the two rollers are accurate and stable after installation, and preventing positional shifts due to vibrations, tension changes, or equipment operation impacts during unwinding. The fixed mounting of the unwinding roller 100 and idler roller 300 ensures that the material roll 200 maintains stable contact with the two rollers during unwinding, reducing relative sliding between the material roll 200 and the rollers, preventing scratches on the material surface caused by sliding, thus protecting the material's appearance, reducing wear on the rollers caused by sliding friction, and extending the rollers' service life.

[0053] In addition, the fixed installation of the two rollers can ensure the stability of the transmission path when the material roll 200 is unwound, so that the material can enter the subsequent traction structure along the fixed path after being released from the unwinding roller 100. This avoids the material transmission path from changing due to the position of the rollers, thereby preventing the printed pattern from deviating due to material deviation and improving the product qualification rate.

[0054] Example 4:

[0055] This application provides an unwinding mechanism for a packaging bag printing equipment. In addition to the above-mentioned technical features, the unwinding mechanism of the packaging bag printing equipment in this application also includes the following technical features.

[0056] like Figures 1 to 3 As shown, a linear actuator 940 is also installed at the bottom of the support platform 900 to drive the support platform 900 to move along the slide rail 910.

[0057] In this embodiment, the linear actuator 940 at the bottom of the support platform 900 provides power to drive the support platform 900 to move along the slide rail 910. Compared with manual adjustment, it can achieve precise control of the position of the support platform 900, and can quickly and accurately adjust the support platform 900 to the required position, ensuring that the material roll 200 is precisely aligned with the traction structure, avoiding material deviation caused by manual adjustment errors, improving material alignment accuracy, and thus ensuring the accuracy of pattern printing position in subsequent printing processes, reducing printing defects caused by misalignment.

[0058] Meanwhile, the linear actuator 940 can flexibly adjust the drive speed and displacement according to the control signal from the controller 700. During the unwinding process, it can fine-tune the position of the support platform 900 in real time based on the unwinding status of the material roll 200, changes in remaining weight, or slight offsets in the traction structure. This ensures that the material roll 200 always maintains optimal alignment with the traction structure, maintains the stability of material transmission, avoids tension fluctuations caused by positional deviations, and further protects thin materials from tension impacts. The linear actuator 940 here can be either a pneumatic cylinder or a hydraulic cylinder.

[0059] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0060] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An unwinding mechanism for a packaging bag printing equipment, characterized in that: include: Unwinding roller (100) is used to support the roll of printing material (200); An idler roller (300) is spaced apart from the unwinding roller (100) and together with the unwinding roller (100) supports the material roll (200); The first motor (110) is mechanically connected to the unwinding roller (100) and is used to drive the unwinding roller (100) to rotate; The power assembly includes a rotatable pull roller (400) that pulls printing material out of a printing roller and a second motor (410) connected to the pull roller (400) and driving the pull roller (400) to rotate; The adjustment mechanism includes a pressure roller (500) that rotates with the pull roller (400) and an adjustment assembly (600) for maintaining the pressure between the pressure roller (500) and the pull roller (400), the adjustment assembly (600) being connected to the pressure roller (500); It also includes a controller (700), which is connected to the first motor (110) and the second motor (410). The controller (700) is used to send a first control signal representing the required speed to the first motor (110) and a second signal representing the required torque to the second motor (410).

2. The unwinding mechanism of a packaging bag printing equipment according to claim 1, characterized in that: It also includes a laser sensor (800), which is connected to the controller (700) and located above the material roll (200) for detecting the remaining unwound material on the material roll (200).

3. The unwinding mechanism of a packaging bag printing equipment according to claim 2, characterized in that: The distance between the idler roller (300) and the unwinding roller (100) is fixed, and the distance between them is set to support the material roll (200) when the diameter of the material roll (200) is at its widest, and to prevent the material roll (200) from falling between the unwinding roller (100) and the idler roller (300) when the diameter of the material roll (200) is at its narrowest.

4. The unwinding mechanism of a packaging bag printing equipment according to claim 3, characterized in that: The idler roller (300) and the unwinding roller (100) are equipped with a support platform (900). The bottom of the support platform (900) is equipped with a slide rail (910) extending in a direction parallel to the axis of the unwinding roller (100). The support platform (900) is slidably mounted on the slide rail (910) by a slider (920).

5. The unwinding mechanism of a packaging bag printing equipment according to claim 4, characterized in that: The support platform (900) is provided with an installation platform (930) for supporting the idler roller (300) and the unwinding roller (100), and the unwinding roller (100) and the idler roller (300) are fixedly installed on the platform.

6. The unwinding mechanism of a packaging bag printing equipment according to claim 5, characterized in that: The bottom of the support platform (900) is also equipped with a linear actuator (940) for driving the support platform (900) to move along the slide rail (910).

Images